2125643551 has 4 divisors (see below), whose sum is σ = 2125769632. Its totient is φ = 2125517472.

The previous prime is 2125643549. The next prime is 2125643587. The reversal of 2125643551 is 1553465212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2125643551 - 2¹ = 2125643549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125643851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32970 + ... + 73063.

It is an arithmetic number, because the mean of its divisors is an integer number (531442408).

Almost surely, 2^2125643551 is an apocalyptic number.

2125643551 is a deficient number, since it is larger than the sum of its proper divisors (126081).

2125643551 is a wasteful number, since it uses less digits than its factorization.

2125643551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126080.

The product of its digits is 36000, while the sum is 34.

The square root of 2125643551 is about 46104.7020487065. The cubic root of 2125643551 is about 1285.7705666092.

The spelling of 2125643551 in words is "two billion, one hundred twenty-five million, six hundred forty-three thousand, five hundred fifty-one".